Fix quoted glob in srch-basic-functionality

One of the phases of this test wanted to delete files but got the glob
quoting wrong.  This didn't matter for the original test but when we
changed the test to use its own xattr name then those existing undeleted
files got confused with other files in later phases of the test.

This changes the test to delete the files with a more reliable find
pattern instead of using shell glob expansion.

Signed-off-by: Zach Brown <zab@versity.com>

tests/tests/srch-basic-functionality.sh

@@ -66,7 +66,7 @@ while [ "$i" -lt "8" ]; do
 done
 # wait for srch compaction worker delay
 sleep 10
-rm -rf "$T_D0/single-block-*"
+find "$T_D0" -type f -name 'single-block-*' -delete
 
 echo "== create entries in current log"
 DIR="$T_D0/dir"